Size: NPS1/2â-24â Rating: Class150-2500 LB Material: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel End: RF, RTJ Operation: Operation: Manual, Gear, Pneumatic, Electric Temperature Rangeï¼-46~450â Design & Manufacture Standard: API6D, ASME16.34, BS5351 Face to Face: ASME B16.10, API6D End Connection: ASME B16.5, ASME B16.25 Test Standard: API6D, API598 Metal to metal seal design between ball and seats Double block and bleed Cavity pressure self relief Blowout-proof stem Seat designed with dust-proof and automatic cleaning function Antic-static device